Diagnostic Manual - SRS MAN-00081-6
Scorpio mHawk
January 2010/Rev 1
The repair methods given by the manufacturer in this document are based on the technical specifications, current at the time of release. The methods may be
modified as a result of changes introduced by the manufacturer in the production of the various component units and accessories from which the vehicles are
manufactured. The reproduction, translation, transmission, in part of or whole of the present document, are prohibited without the prior written consent of Mahindra &
Mahindra Ltd. The use of this document by any person other than the trained personnel, at the Authoirsed Service Centre of Mahindra & Mahindra Ltd., will amount
to unauthorized use and shall be liable for penalty/prosecution © 2010 Mahindra & Mahindra Ltd.
Important terms
These terms need to be understood before we start going through the diagnostic.
Loop Resistance: The resistance offered to current flow by the wiring from the
ACU to the individual components (Pretensioners & airbags) is called the loop
resistance of that particular circuit. For the effective functioning, each wiring circuit
in the SRS system should be having its resistance value within a certain limit. The
ACU will be monitoring the loop resistance continuously and will register DTCs if
the value is out of the defined range. The contacts are gold plated to prevent the
variation of resistance value due to oxidation.
• If the resistance is less than the lower limit, the error will be registered under
short circuit for that particular circuit, as the wiring offers less resistance
than required.
• If the resistance is more than the upper limit, the error will be registered
under open circuit for that particular circuit, as the wiring offers more
resistance than required.
Squib: Terminal connectors at the Airbag and Pretensioner ends are called
Squibs. They are provided with shunts, which does not allow current flow unless
and otherwise it is properly inserted in to the module. So it is impossible to
measure the continuity, voltage or resistance of these lines with multimeter.
Forceful insertion of the multimeter terminal will cause permanent damage to the
squibs.
Important instructions
•
Never repair any wiring. It is always recommended to replace the wiring.
•
Never try to probe the Airbag or Pretensioner with multimeter. The current
from the internal battery of the multimeter may fire the component and
deploy the airbags.
•
Always lock the ACU through the diagnostic tester before doing any
diagnostic job related to Airbag system.
•
Always lock the ACU and remove the battery negative terminal while doing
any body repair.
Note: Refer Annexure to understand the usage of diagnostic tester.
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